java 各种 proxy 示例

README.md

@@ -397,10 +397,10 @@
 
 如下是草稿目录，未来需要整理下
 
-# lab-9
-
-记录阅读极客时间《数据结构与算法之美》的题目。
-
 # lab-50
 
 Email 示例
+
+# lab-69-proxy
+
+动态代理

lab-69-proxy/lab-69-proxy-cglib/pom.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>lab-69</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-69-proxy-cglib</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>cglib</groupId>
+            <artifactId>cglib</artifactId>
+            <version>3.3.0</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java

@@ -0,0 +1,19 @@
+package cn.iocoder.springboot.labs.lab69;
+
+import cn.iocoder.springboot.labs.lab69.intercept.UserServiceMethodInterceptor;
+import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
+import net.sf.cglib.proxy.Enhancer;
+
+public class TestProxyMain {
+
+    public static void main(String[] args) {
+        // 创建 cglib 增强对象
+        Enhancer enhancer = new Enhancer();
+        enhancer.setSuperclass(UserServiceImpl.class); // 设置父类
+        enhancer.setCallback(new UserServiceMethodInterceptor());
+        // 创建代理
+        UserServiceImpl userService = (UserServiceImpl) enhancer.create();
+        userService.create("yunai", "buzhidao");
+    }
+
+}

lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/intercept/UserServiceMethodInterceptor.java

@@ -0,0 +1,17 @@
+package cn.iocoder.springboot.labs.lab69.intercept;
+
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import java.lang.reflect.Method;
+
+public class UserServiceMethodInterceptor implements MethodInterceptor {
+
+    public Object intercept(Object object, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
+        System.out.println("before invoke");
+        Object ret = methodProxy.invokeSuper(object, args);
+        System.out.println("after invoke");
+        return ret;
+    }
+
+}

lab-69-proxy/lab-69-proxy-cglib/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java

@@ -0,0 +1,9 @@
+package cn.iocoder.springboot.labs.lab69.service;
+
+public class UserServiceImpl {
+
+    public void create(String username, String password) {
+        System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
+    }
+
+}

lab-69-proxy/lab-69-proxy-jdk/pom.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>lab-69</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-69-proxy-jdk</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.7</version>
+        </dependency>
+    </dependencies>
+
+</project>

lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/GenerateProxyMain.java

@@ -0,0 +1,25 @@
+package cn.iocoder.springboot.labs.lab69;
+
+import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
+import org.apache.commons.io.IOUtils;
+import sun.misc.ProxyGenerator;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Proxy;
+
+/**
+ * 生成 JDK {@link Proxy} 的示例代码
+ *
+ * 生成后，我们可以反编译查看具体的类
+ */
+public class GenerateProxyMain {
+
+    public static void main(String[] args) throws IOException {
+        // 生成字节码
+        byte[] classFile = ProxyGenerator.generateProxyClass("$Proxy11", UserServiceImpl.class.getInterfaces());
+        // 写入到磁盘
+        IOUtils.write(classFile, new FileOutputStream("/Users/yunai/ls/$Proxy11.class"));
+    }
+
+}

lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/TestProxyMain.java

@@ -0,0 +1,26 @@
+package cn.iocoder.springboot.labs.lab69;
+
+import cn.iocoder.springboot.labs.lab69.handler.UserServiceHandler;
+import cn.iocoder.springboot.labs.lab69.service.UserService;
+import cn.iocoder.springboot.labs.lab69.service.UserServiceImpl;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Proxy;
+
+/**
+ * 使用 JDK {@link Proxy} 实现一个动态代理的示例
+ */
+public class TestProxyMain {
+
+    public static void main(String[] args) {
+        // 创建 UserService 对象
+        UserService userService = new UserServiceImpl();
+        // JDK 处理器
+        InvocationHandler handler = new UserServiceHandler(userService);
+        // 创建代理
+        UserService userServiceProxy = (UserService) Proxy.newProxyInstance(TestProxyMain.class.getClassLoader(), userService.getClass().getInterfaces(), handler);
+        // 执行
+        userServiceProxy.create("yunai", "buzhidao");
+    }
+
+}

lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/handler/UserServiceHandler.java

@@ -0,0 +1,24 @@
+package cn.iocoder.springboot.labs.lab69.handler;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+
+public class UserServiceHandler implements InvocationHandler {
+
+    /**
+     * 被代理的对象
+     */
+    private final Object object;
+
+    public UserServiceHandler(Object object) {
+        this.object = object;
+    }
+
+    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+        System.out.println("before invoke");
+        Object ret = method.invoke(object, args);
+        System.out.println("after invoke");
+        return ret;
+    }
+
+}

lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserService.java

@@ -0,0 +1,7 @@
+package cn.iocoder.springboot.labs.lab69.service;
+
+public interface UserService {
+
+    void create(String username, String password);
+
+}

lab-69-proxy/lab-69-proxy-jdk/src/main/java/cn/iocoder/springboot/labs/lab69/service/UserServiceImpl.java

@@ -0,0 +1,9 @@
+package cn.iocoder.springboot.labs.lab69.service;
+
+public class UserServiceImpl implements UserService {
+
+    public void create(String username, String password) {
+        System.out.println(String.format("登陆的用户名(%s) 密码(%s)", username, password));
+    }
+
+}

lab-69-proxy/pom.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>labs-parent</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-69</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>lab-69-proxy-jdk</module>
+        <module>lab-69-proxy-cglib</module>
+    </modules>
+
+
+</project>

pom.xml

@@ -76,6 +76,8 @@
 <!--        <module>lab-66</module>-->
 <!--        <module>lab-67</module>-->
 <!--        <module>lab-68-spring-security-oauth</module>-->
+        <module>lab-69-proxy</module>
+
 
         <!-- Spring Cloud 示例 -->
 <!--        <module>labx-01-spring-cloud-alibaba-nacos-discovery</module>-->